Pale Moon is optimized for speed and efficiency. Like the desktop version, it supports add-ons from the Mozilla Add-Ons catalog. This Android port comes from XDA developer cyansmoker, and it can be personalized with add-ons from the Firefox add-ons catalog. The browser is free to download and use, but it's not available in Google Play, so you'll need to enable third party app support and sideload it.

The download link below is for a copy of the file hosted on Mega. If it proves problematic, take a look at the thread on XDA Developers for mirrors. It's also worth keeping an eye on the thread if you run into problem with the app itself. It is currently in alpha and not guaranteed to work with every device.